<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<?
/**
 * 将字符串转换成unicode编码
 *
 * @param string $input
 * @param string $input_charset
 * @return string
 */
function str_to_unicode($input, $input_charset = 'gbk'){
 $input = iconv($input_charset, "gbk", $input);
 preg_match_all("/[\x80-\xff]?./", $input, $ar);
 $b = array_map('utf8_unicode_', $ar[0]);
 $outstr = join("", $b);
 return $outstr;
}

function utf8_unicode_($c, $input_charset = 'gbk'){
 $c = iconv($input_charset, 'utf-8', $c);
 return utf8_unicode($c);
}
// utf8 -> unicode
function utf8_unicode($c) {
 switch(strlen($c)) {
 case 1:
 return $c;
 case 2:
 $n = (ord($c[0]) & 0x3f) << 6;
 $n += ord($c[1]) & 0x3f;
 break;
 case 3:
 $n = (ord($c[0]) & 0x1f) << 12;
 $n += (ord($c[1]) & 0x3f) << 6;
 $n += ord($c[2]) & 0x3f;
 break;
 case 4:
 $n = (ord($c[0]) & 0x0f) << 18;
 $n += (ord($c[1]) & 0x3f) << 12;
 $n += (ord($c[2]) & 0x3f) << 6;
 $n += ord($c[3]) & 0x3f;
 break;
 }
 return "&#$n;";
}

/**
 * 将unicode字符转换成普通编码字符
 *
 * @param string $str
 * @param string $out_charset
 * @return string
 */
function str_from_unicode($str, $out_charset = 'gbk'){
 $str = preg_replace_callback("|&#([0-9]{1,5});|", 'unicode2utf8_', $str);
 $str = iconv("UTF-8", $out_charset, $str);
 return $str;
}

function unicode2utf8_($c){
 return unicode2utf8($c[1]);
}
function unicode2utf8($c){
 $str="";
 if ($c < 0x80) {
 $str.=$c;
 } else if ($c < 0x800) {
 $str.=chr(0xC0 | $c>>6);
 $str.=chr(0x80 | $c & 0x3F);
 } else if ($c < 0x10000) {
 $str.=chr(0xE0 | $c>>12);
 $str.=chr(0x80 | $c>>6 & 0x3F);
 $str.=chr(0x80 | $c & 0x3F);
 } else if ($c < 0x200000) {
 $str.=chr(0xF0 | $c>>18);
 $str.=chr(0x80 | $c>>12 & 0x3F);
 $str.=chr(0x80 | $c>>6 & 0x3F);
 $str.=chr(0x80 | $c & 0x3F);
 }
 return $str;
}

/**
 * 模拟JS里的unescape
 *
 * @param unknown_type $str
 * @return unknown
 */
function unescape($str) {
 $str = rawurldecode($str);
 preg_match_all("/(?:%u.{4})|.{4};|&#\d+;|.+/U",$str,$r);
 $ar = $r[0];
 #print_r($ar);
 foreach($ar as $k=>$v) {
 if(substr($v,0,2) == "%u")
 $ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,-4)));
 elseif(substr($v,0,3) == "")
 $ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,3,-1)));
 elseif(substr($v,0,2) == "&#") {
 echo substr($v,2,-1)."
";
 $ar[$k] = iconv("UCS-2","GB2312",pack("n",substr($v,2,-1)));
 }
 }
 return join("",$ar);
}

echo str_to_unicode('我们一起来','utf-8');
?>


</body>
</html>

